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/**
References:
1. https://developers.google.com/web/fundamentals/primers/service-workers
2. https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook
3. https://googlechrome.github.io/samples/service-worker/
4. https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers
5. https://serviceworke.rs/
*/
const CACHE_NAME = 'runtime';
self.skipWaiting();
self.addEventListener('fetch', function (event) {
// Do nothing if not from the same origin
if (!event.request.url.startsWith(self.location.origin)) return;
event.respondWith(
caches.match(event.request).then(function (response) {
// Cache hit - return response
if (response) {
return response;
}
return fetch(event.request).then(function (response) {
// Check if we received a valid response
if (!response || response.status !== 200 || response.type !== 'basic') {
return response;
}
// IMPORTANT: Clone the response. A response is a stream
// and because we want the browser to consume the response
// as well as the cache consuming the response, we need
// to clone it so we have two streams.
var responseToCache = response.clone();
caches.open(CACHE_NAME).then(function (cache) {
cache.put(event.request, responseToCache);
});
return response;
});
})
);
});
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